Cat-a-wampus (not sure if that is a word in anyones world but mine) but it means usually crooked. Bad I know. But I do not use a ruler for these.I usually stay away from patterns with them because my seams take points off and I do not like no pionts on my fg.

Below is my favorite way.....I like it because it makes FOUR at once and each one is perfect.http://www.youtube.com/watch?v=id3WjzE36NI
After you make one set it is so easy and you can do it without much effort at all. I bought the rulers on Amazon at a good price.